Jacob Willekens
Dutch admiral

Jacob Willekens or Wilckens (1564–1649) was a Dutch admiral on a fleet to the Dutch Indies, and a herring seller, who went to sea again at the age of fifty for the Dutch West Indies Company. His best-known success was the conquest of São Salvador da Bahia, the then capital of Brazil.
His fleet, which included Dutch corsair Piet Hein as vice admiral, departed from Texel on December 22, 1623, with between 26 and 36 ships and 3,300 sailors towards South America. At the beginning of June 1624, they began their attack from sea and soon captured the Portuguese stronghold with little resistance. They occupied Bahia for over a year before the local population took up arms under acting governor Matias de Albuquerque and Archbishop Dom Marcos Teixeira who eventually expelled them with the help of a combined Spanish-Portuguese fleet numbering 52 warships and 12,000 soldiers in May 1625. This was the first major WIC privateering expedition to the region.
He was also planning to participate in an attack on Rio de Janeiro with Hein in 1626, but after a dispute over who would be in command, the two separated with Willekens returning to Amsterdam. Willekens joined the vroedschap in 1639 and the Admiralty of Amsterdam. He was buried in the Zuiderkerk in 1649.
Begin with the source’s own compact description: “Jacob Willekens” is dutch admiral. The dossier treats that line as a proposition to test through Jacob, Willekens and Dutch, not as a finished interpretation.
Why this record matters
The phrase “dutch admiral” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated May 21, 2026. The linked authority identifier is Q6119464. VIAF identifies the subject as 1689151595763805470001. The Library of Congress control number is n82204397. 3 of 3 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1564, 1649, 1623 and 1624.
The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Jacob Willekens”, its source revision and the description used here.
- Expand the search: follow Jacob Willekens primary sources, Jacob Willekens archive and Jacob research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Jacob Willekens”?
- What terminology or title could unlock a more precise catalogue search?
- Which cited source is closest to the event, object or claim?
Search terms from this dossier
This entry incorporates text from “Jacob Willekens” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.